syms n x T wc p; 
f1=n*x^n/x;
classf1=class(f1) 
f2=sym(log(T)^2*T+p);
classf2=class(f2)
f3=sym('w+sin(a*z)');
classf3=class(f3) 
f4=pi+atan(T*wc);
classf4=class(f4)
